The number of value reallocations per minute performed
by the active defragmentation process. This is derived from active_defrag_hits statistic at Redis INFO.

Number

BytesUsedForCache

The total number of bytes allocated by Redis for all purposes, including the dataset,
buffers, etc. This is derived from used_memory statistic at Redis INFO.

Bytes

CacheHits

The number of successful read-only key lookups in the main dictionary. This is derived
from keyspace_hits statistic at Redis INFO.

Count

CacheMisses

The number of unsuccessful read-only key lookups in the main dictionary. This is derived
from keyspace_misses at Redis INFO.

Count

CurrConnections

The number of client connections, excluding connections from read
replicas. ElastiCache uses two to three of the connections to monitor the
cluster in each case. This is derived from the connected_clients statistic at Redis INFO.

Count

EngineCPUUtilization

EngineCPUUtilization provides access to the Redis process CPU utilization to gain better
insights into your Redis workloads. As Redis is single threaded and uses just
one CPU core at any given
point in time, EngineCPUUtilization provides more precise visibility into the load of the
Redis process itself.

EngineCPUUtilization adds to the pre-existing CPUUtilization metric which
exposes CPU utilization for the server instance as a whole including other
operating system and management
processes. We recommend that you use both EngineCPUUtilization and CPUUtilization
metrics together to get a detailed understanding of CPU utilization for your
Redis environment.

Percent

Evictions

The number of keys that have been evicted due to the
maxmemory limit. This is derived from the evicted_keys statistic at Redis INFO.

Count

NewConnections

The total number of connections that have been accepted by the server
during this period. This is derived from the total_connections_received statistic at Redis INFO.

Count

Reclaimed

The total number of key expiration events. This is derived from the expired_keys statistic at Redis INFO.

Count

ReplicationBytes

For nodes in a replicated configuration, ReplicationBytes reports the number of bytes
that the primary is sending to all of its replicas. This metric is representative
of the write load on the replication group. This is derived from the master_repl_offset statistic
at Redis INFO.

Bytes

ReplicationLag

This metric is only applicable for a node running as a read
replica. It represents how far behind, in seconds, the replica is in
applying changes from the primary node.

Seconds

SaveInProgress

This binary metric returns 1 whenever a background save
(forked or forkless) is in progress, and 0 otherwise. A background
save process is typically used during snapshots and syncs. These
operations can cause degraded performance. Using the
SaveInProgress metric, you can diagnose whether or not
degraded performance was caused by a background save process. This is derived
from the rdb_bgsave_in_progress statistic at Redis INFO.

Count

EngineCPUUtilization availability

Nodes in a region created or replaced after the date and time specified in the following
table
will include the EngineCPUUtilization metric.

Region

Region name

EngineCPUUtilization availability

us-east-2

US East (Ohio)

February 16, 2017

17:21 (UTC)

us-east-1

US East (N. Virginia)

February 8, 2017

21:20 (UTC)

us-west-1

US West (N. California)

February 14, 2017

22:23 (UTC)

us-west-2

US West (Oregon)

Febrary 20, 2017

19:20 (UTC)

ap-northeast-1

Asia Pacific (Tokyo)

February 14, 2017

19:58 (UTC)

ap-northeast-2

Asia Pacific (Seoul)

Available on all nodes.

ap-northeast-3

Asia Pacific (Osaka-Local)

Available on all nodes.

ap-south-1

Asia Pacific (Mumbai)

February 7, 2017

02:51 (UTC)

ap-southeast-1

Asia Pacific (Singapore)

February 13, 2017

23:40 (UTC)

ap-southeast-2

Asia Pacific (Sydney)

February 14, 2017

03:33 (UTC)

ca-central-1

Canada (Central)

Available on all nodes.

cn-north-1

China (Beijing)

February 16, 2017

22:39 (UTC)

cn-northwest-2

China (Ningxia)

Available on all nodes.

eu-central-1

EU (Frankfurt)

February 15, 2017

00:46 (UTC)

eu-west-1

EU (Ireland)

February 7, 2017

21:30 (UTC)

eu-west-2

EU (London)

February 16, 2017

18:58 (UTC)

eu-west-3

EU (Paris)

Available on all nodes.

sa-east-1

South America (São Paulo)

February 7, 2017

04:35 (UTC)

us-gov-west-1

AWS GovCloud (US-West)

February 16, 2017

20:11 (UTC)

These are aggregations of certain kinds of commands, derived from info
commandstats:

Metric

Description

Unit

CurrItems

The number of items in the cache. This is derived from the Redis
keyspace statistic, summing all of the keys in the entire
keyspace.

Count

GetTypeCmds

The total number of read-only type commands. This
is derived from the Redis commandstats statistic by summing all of the
read-only type commands (get, hget,
scard, lrange, etc.)

Count

HashBasedCmds

The total number of commands that are hash-based. This is derived
from the Redis commandstats statistic by summing all of the commands
that act upon one or more hashes.

Count

HyperLogLogBasedCmds

The total number of HyperLogLog-based commands.
This is derived from the Redis commandstats statistic
by summing all of the pf type of commands
(pfadd, pfcount,
pfmerge, etc.).

Count

KeyBasedCmds

The total number of commands that are key-based. This is derived from
the Redis commandstats statistic by summing all of the commands that act
upon one or more keys across multiple data structures (del, expire, rename, etc.).

Count

ListBasedCmds

The total number of commands that are list-based. This is derived
from the Redis commandstats statistic by summing all of the commands
that act upon one or more lists.

Count

SetBasedCmds

The total number of commands that are set-based. This is derived from
the Redis commandstats statistic by summing all of the commands that act
upon one or more sets.

Count

SetTypeCmds

The total number of write types of commands. This
is derived from the Redis commandstats statistic by summing all of the
mutative types of commands that operate on data
(set, hset, sadd, lpop, etc.)

Count

SortedSetBasedCmds

The total number of commands that are sorted set-based. This is
derived from the Redis commandstats statistic by summing all of the
commands that act upon one or more sorted sets.

Count

StringBasedCmds

The total number of commands that are string-based. This is derived
from the Redis commandstats statistic by summing all of the commands
that act upon one or more strings.

Count

StreamBasedCmds

The total number of commands that are stream-based. This is derived from the Redis
commandstats statistic at Redis INFO by summing all of the commands that act upon one or more streams data type.

Count

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